Braking device for motor vehicles



June 13, 1933.

C. SCHAEFFER BRAKING DEVICE FOR MOTOR VEHICLES Filed Feb. 1951 2 Sheets-Sheet 1 June 13, 1933. c. SCHAEFFER BRAKING DEVICE FOR MOTOR VEHICLES Filed Feb. 4. 1931 2 Sheets-Sheet 2 v m/mswrne can move yieldingly back and forth rela- 16 d a lever 17 925 with respect to the chassis, which backward braking action will immediately produce a v the rigging arrangement on the ratio the thrust tube 5 into engagement with the r other form of construction.

Patented June 13, 1933' J CHAR-LES SCHAEFFER, OF PAfiIS; FRANCE, ASSIGNOR TO STE .ANME DES ANCIENS ETABLISSEMENTS PANI-IARD 8t LEVASSOR, OF PARIS, FRANCE STATES PATENT OFFICE BRAKING DEVICE FOR MOTOR VEHICLES Application filed February 4, 1931. Serial No. 513,424, and in France February 14, 1930.

It is more and more. necessary to increase In Fig. 1, 1 designates the rear axle casing the braking power on motor vehicles and and 2 the chassis which is suspended on the above all on those intended. for an industrial same by a spring 3 and hangers 4: allowing purpose on account of their ever increasing the casing to move back and forth with re- 5 weights and speeds. spect to the chassis.

As the driver can only exert ajlimited The thrust tube 5 bears against a cross braking effort on the brake pedal, an exmember6of the chassis;however, it can move ternal force is often used to increase the brake away therefrom while compressing the ower and said force is obtained by means springs? when a backward movement of the 10 of either pneumatical or hydraulical or merear axle casing with respect to the chassis 69 chanical servo-motors, but these devices are is produced by braking.

all intricate and their fitting on vehicles re- The chassis as shown is fitted with brakes sults in important costs. both at the rear and front thereof; 8 and 9 This invention has for its object to provide designate the brake tightening levers for 15 a very simple device which allows to conthese brakes, which are connected by rods 10,

siderably increase the braking power With- 11 to levers 12 secured on a shaft 13. The

out using any auxiliary apparatus. latter is mounted in bearings 14 carried by According to this invention, the rear aXle the thrust tube 5 and operated by the brake casing is SO COIll'lQCtGd t0 the ChELSSlS that 1i? P3613115 to is ecured through a rod i y 9 the latter and the brake Control As the driver depresses the pedal 15 he will rigging 15 S0 a a g d as Set p an autoin the usual .mannerproduce a definite tightmatic lncrease 1n the tlghtening of the brakes ening f th f t d rear b k th h as the rear axle casing s movlng backwards th i i 1 171 13 12 10 8 d 11 9, .S h

movement will take place automatically as. backwardmovement of the rear axle Casing, 9 101 the brakes begln to be tlghtened Suffi the tube 5 and the shaft 13 with respect to the Glen ychassis as rod 16 is maintained by the pres The bmklng P W Obtalned 1s a func' sure of the foot on the pedal it will not par- 30 U of the mass m motlon and of the 9 take to such backward movement, so that the batikwaril travel i the i f r latter will cause the levers 17 and 12 to swin wh1ch tself 1s a function of the 1n1t1al brakfurther in the direction for an increase g aCJFiOn Set up b h drlverv d the the braking effect (arrow 7). I power increase obtained 1s also dependent on Vo release" the Springs 7 will bring again Errataair-areas tarts 6 qt s -s t al 15 will be and the effort set up by the relative displace 129 3: 5 i fi i g fg t l b 5 ment of the rear axle casing with the chassis 1g z fi W e 1s 40 on the other haml I connec e to e c assis, secure to its ront An embodiment of a braking device accordi ig fi gg q tig 1s t h d e aoua a rigi W1 aseeve 0 mg to thls mventlon B S Own m e raw adapted to sllde 1n a bush 18 secured to the d d h t b f l gg i an ggf g fij g ggi e chassls and wh1ch carrles a flange 19 adapted 45 Figure 2 is a fractional vertical cross sect bea'faga'inst the a face of the member tion showing the elastic connection of the i PP g 7 ar colled about bolts 0 thrust tube with the chassis, some of theparts wh1ch P J Q gh the Bald flange a being shown in elevation. member 6 of the chassis. I I, 0

Figure 3 is an explanative diagram of an The ball 51 houses the gimbal 21 by which the main shaft 22 is connected in the usual 1 manner with the driving shaft 23 received in tube 5.

Figure 3 shows that it is not necessary that the shaft 13 should be mounted in brackets partaking of the backward movement of the the backward movement of therear axle casing with respect to the chassis and the rigging 16, 17, 20, 10 carried thereby will set up an additional deflection of the lever 8 in the direction for braking (arrow 7), which results in a considerable increase of the braking power.

It is to be understood that the invention is not limited to the embodiments shown and that numerous rigging arrangements allowin g the backward movement of the rear axle casing with respect to the chassis with a View to increase the tightening of the brakes can be devised easily.

I claim:

1. In a braking device for motor vehicles comprising a chassis, a rear axle casing, brakes acting upon the wheels, a brake actuating pedal lever and a brake rigging connecting the said lever to the brakes, the coinbination of connecting means between the said rear axle casing and the said chassis, s0 arranged as to allow the said rear axle casing to move backwards and forwards relatively to the chassis, the said brake rigging being adapted to set up an automatic increase of the tightening of the brakes when the said rear axle casing moves backwards relatively to the said chassis, the said rigging comprising a transverse shaft, levers mounted on the said shaft, rods connected to the said levers and adapted to actuate the brakes, brackets carrying the said transverse shaft, the said brackets being so arranged as to partake of the forward and backward motion of the said rear axle casing.

2. In a braking device for motor vehicles comprising a chassis, a rear axle casing, brakes acting upon the wheels, a brake operating pedal lever and a brake rigging connecting the said lever to the brakes, the combination of connecting means between the said rear axle casing and the said chassis, so

arranged as to allow the said rear axle casing to move backwards relatively to the said chassis, the said means comprising a thrust tube for transmitting the thrust of the said rear axle casing to the said chassis, a spherical socket connected to the front end of the said thrust tube, a ball on which is slidably adjusted the said spherical socket, a bush connected to the said ball, a flange connected to the said bush, a sleeve connected to a portion of the chassis in which slides the said bush, springs constantly urging the said flange into engagement with the said portion of the chassis, and the said brake rigging being adapted to set up an automatic increase of the tightening of the brakes when the rear i CHARLES SCHAEFFER. 

